Thank you, but I can confirm that the wiring is not the problem by excluding the tmrpcm library and confirming that the display works correctly. Furthermore, I do not know how the tmrpcm library works...I've been studying for it for a few weeks but I still don't grasp how it works.

I read the entire first page of google on pcm to pwm, but I couldn't find a breakthrough. What would you suggest I look at closely from the google results?